Tidal effects have the potential to measurably affect water level measurements and the estimation of groundwater flow direction and gradient. This has significant implications for the prediction and monitoring of contaminant plumes in coastal areas. Studies were conducted at two near-coastal sites in San Diego County, California, to evaluate the impact of tidal variability on the interpretation of water level data. For the two sites studied, Santa Clara Point and Spanish Landing Flats, variations in measured water levels ranged up to 2.2 feet in response to a 6-foot tidal variation in Mission Bay and up to 0.15 feet in response to a 5- to 8-foot tidal variation in San Diego Bay. Gradient direction estimated from time-specific groundwater contour maps varied up to 25 degrees over several tidal cycles. These studies and those conducted by previous workers emphasize the importance of understanding the type and magnitude of tidal response within a monitoring network when evaluating contaminant plumes in coastal areas.

Related articles

IntroductionAGRAGEL is a cross-linked copolymer of acrylic acid and acrylamide partially neutralized as potassium/ ammonium salt. The polymer is in its dry form a granulate and forms a gel-like material upon addition of water or aqueous solutions. Due to the cross-linking it is insoluble in water. Uptake of water is facilitated mainly by the negative carboxylic groups of the polymer and their hydration with water molecules. Complete solubilization is hindered because of the cross-linking of different polymer...

For most people, the term ‘data analytics’ conjures up images of Amazon, Facebook and Google: digitally born companies that gather huge data sets in order to better target products, adverts or services across a huge customer base.
When it comes to really transformational analytics projects, this type of business, using this type of data is the exception rather than the rule. However, because they are conspicuously successful and well known, they have become poster children for analytics. This is a...

Rothamsted Research, a leading agricultural research institution, is attempting to make data from long-term experiments available to all.
In partnership with a data consultancy, is it developing a method to make complex results accessible and useable.
The institution is a member of the Godan Initiative that aims to make data available to the scientific community.
In September, Godan called on the public to sign its global petition to open agricultural research data.
“The continuing challenge we face is...

The people responsible for conducting oil in water measurements understand thatthe measurement can be quite challenging. Wastewater from different sources cancontain many different types of hydrocarbons, each with different chemical make-ups.On top of the lack of chemical uniformity in different oils, there has been a largevariety of methods developed to quantify the oil in the wastewater. While none of thefollowing methods is perfect, each will have its own advantages and disadvantagesfor oil in water analysis.Oil...

Customer comments

No comments were found for Tidal influences on unconfined water levels in wells.. Be the first to comment!